class_docstr: A class for building a MorphLut from a descriptive language
  
  The input patterns is a list of a strings sequences like these::
  
      4:(...
         .1.
         111)->1
  
  (whitespaces including linebreaks are ignored). The option 4
  describes a series of symmetry operations (in this case a
  4-rotation), the pattern is described by:
  
  - . or X - Ignore
  - 1 - Pixel is on
  - 0 - Pixel is off
  
  The result of the operation is described after "->" string.
  
  The default is to return the current pixel value, which is
  returned if no other match is found.
  
  Operations:
  
  - 4 - 4 way rotation
  - N - Negate
  - 1 - Dummy op for no other operation (an op must always be given)
  - M - Mirroring
  
  Example::
  
      lb = LutBuilder(patterns = ["4:(... .1. 111)->1"])
      lut = lb.build_lut()
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docstr: Compile all patterns into a morphology lut.
  
  TBD :Build based on (file) morphlut:modify_lut
docstr_tok: ["Compile","all","patterns","into","a","morphology","lut",".","TBD",":","Build","based","on","(","file",")","morphlut",":","modify_lut"]
code: def build_lut(self):
      """Compile all patterns into a morphology lut.
  
      TBD :Build based on (file) morphlut:modify_lut
      """
      self.build_default_lut()
      patterns = []
  
      # Parse and create symmetries of the patterns strings
      for p in self.patterns:
          m = re.search(
              r"(\w*):?\s*\((.+?)\)\s*->\s*(\d)", p.replace("\n", "")
          )
          if not m:
              msg = 'Syntax error in pattern "' + p + '"'
              raise Exception(msg)
          options = m.group(1)
          pattern = m.group(2)
          result = int(m.group(3))
  
          # Get rid of spaces
          pattern = pattern.replace(" ", "").replace("\n", "")
  
          patterns += self._pattern_permute(pattern, options, result)
  
      # compile the patterns into regular expressions for speed
      for i, pattern in enumerate(patterns):
          p = pattern[0].replace(".", "X").replace("X", "[01]")
          p = re.compile(p)
          patterns[i] = (p, pattern[1])
  
      # Step through table and find patterns that match.
      # Note that all the patterns are searched. The last one
      # caught overrides
      for i in range(LUT_SIZE):
          # Build the bit pattern
          bitpattern = bin(i)[2:]
          bitpattern = ("0" * (9 - len(bitpattern)) + bitpattern)[::-1]
  
          for p, r in patterns:
              if p.match(bitpattern):
                  self.lut[i] = [0, 1][r]
  
      return self.lut
  
file_path: catboost/contrib/python/Pillow/py3/PIL/ImageMorph.py
imports: import re
  from .None import Image, _imagingmorph
label_desc: Use image node_id 7 for calling the LutBuilder obj's underlying member method code with example usage: obj.build_lut() and returns: self